BS 65:1988 pdf free download.British Standard Specification for Vitrified clay pipes , fittings , joints and ducts.
1. Scope.
BS 65 specifies requirements for vitrified clay pipes apd fittings with or without sockets, and compat ible accessories, for the construction of drainage and sewerage systems, operated as gravity pipelines, or for use as ducts.
Normal, surface water, perforated, and extra chemically resistant pipes and fittings are covered by the standard, together with ducts. The standard applies to both glazed and unglazed products.
The standard also specifies performance requirements for flexible mechanical joints used with normal and surface water clay pipes and fittings.
NOTE. The pipes and fittings specified may be suitable for use with Joints other than flexible mechanical joints but such joints are outside the scope of this standard.
The requirements specified cover certain dimensions and tolerances, physical and performance characteristics, marking and sampling, and testing and inspection proce dures to verify compliance and to facilitate quality control.
2. References
The titles of the standards publications referred to in BS 65 are listed on the inside back cover.
3. Definitions
For the purposes of BS 65 the following definitions apply.
3.1 Types of pipes and fittings
3.1.1 Normal. Suitable for all drains and sewers, other than where extra chemical resistance Is required.
3.1.2 Surface water. Suitable only for the conveyance of surface water.
3.1.3 Perforated. Suitable for French drains and land drains.
3.1.4 Extra chemically resistant. Suitable for drains and sewers where extra chemical resistance is required.
3.1.5 Ducts. Suitable for the enclosure and protection of underground cables or other services.
3.2 Other definitions
3.2.1 curvature. The angle subtended by the length of a curved fitting at the centre of a circle of nominal radius through the centre-line of the fitting.
3.2.2 joint assembly. The adjacent ends of two pipes and the means of joining them.
9.3 Straight draw. The pipes within a joint assembly shall be separated by 10 mm using the method described in G.3 and when separated shall withstand the constant internal pressure specified in 9.1 for 5 mm without visible leakage.
9.4 Shear resistance. A joint assembly shall be tested by the methods described in G.4. A load of 25 N per mullmetro of nominal size of pipe shalt be applied to a normal pipe joint assembly and a load of 15 N per millimetre of nominal size of pipe shall be applied to a surface water pipe joint assembly. The joint assembly shall withstand the constant internal pressure specified In 9.1 for 5 mm without visible leakage.
9.5 Test for chemical and physical resistance to effluent (for normal pipe joint assemblies only). A joint assembly shall be tested by the methods described in H.2 using all the test solutions specified in H.1. A separate joint assembly shall be used for each test solution. Each joint assembly which has been exposed to one of the test solutions specified in H.1 shall withstand a constant internal pressure of 60 kPa* for 5 mm with no visible leakage.
Section five. Sampling for tests
10. Sampling of pipes and fittings
10.1 Sampling for quality control at the manufacturer’s
works. Sampling and testing procedures in respect of any
batch shall be completed prior to removal from the works
and shall be in accordance with either:
(a) tables 11, 12 and 14 of appendix J and their switching rules, which are consistent with BS 6001 :
Part 1 at an AQL of 6.5 % and inspection level S.3. or
(b) BS 6002 at an AOL of 6.5 % and inspection level S.3.
NOTE. For sampling after delivery from the manufacturer’s works sampling should be in accordance only with table 11 of appendix J, except where the batch is rosubmitted after resection, when 10.2 should then ply. The relevant tests are the same as those listed under 10.1 In table 8.
Isolated batches of units shall be assessed in accordance with table 15 of appendix J with a maximum batch size of 1200.
102 Sampling for resubmitted rejected batches. Batches rejected under the sampling procedure specified in 10.1, or after delivery from the manufacturer’s works, may be resubmitted once, after removal of pipes with previously undetected visible defects, under the tightened inspection procedures given In table 15 of appendix J, in respect only of the defect that caused Initial rejection.
10.3 Type tests. Type testing shall be carried out at least annually, at the rate of one pipe or fitting from each nominal size manufactured.
For the purposes of 8.5, straight fittings or short lengths of pipes shall be tested at a frequency of at least one sample per month.
10.4 Sampling and testing. The relevant sampling procedures and test clauses are as given In table 8.
13. Marking
13.1 A company trade mark or the name of the manufacturer, and a means of identifying the date of manufacture shall preferably be impressed before firing, or, If this is not possible, shall be indelibly marked after firing on each pipe and fitting. The marking shall include identification of factory location if the manufacturer has more than one works.
Where. In the production of fabricated units using fired components, the original marking cannot be retained, a marking shall be applied by the same methods as those used to comply with 13.2 to 13.5, showIng a company trade mark or the name of the manufacturer and a means of identifying the date of fabrication.
13.2 All pipes and fittings shall be clearly and indelibly marked before despatch with the number of BS 65, i.e. BS 65.
In addition, surface water pipes and fittings shall be markec ‘surface water’ or ‘SW’, and extra chemically resistant pipes and fittings shall be marked ‘ECR’. Ducts and duct fittings shall be marked ‘Duct’.
13.3 In addition to the above marking, pipes and pipe sections claimed to comply with the requirements of clause 6 for ‘Extra strength’ or ‘Super strengtW classes shall be marked with the words ‘Extra strength’ or ‘Super strength’ as appropriate.
Pipes of strengths indicated by a dagger footnote mark (t) in tables 3(a), 3(b) and 4(a) shall in addition carry a mark to distinguish them from those made in accordance with previous editions of this standard.
Pipes claimed by the manufacturer to exceed the requirements for super strength pipes or pipe sections shall be marked with the claimed crushing strength and bending moment resistance
13.4 Pipes and fittings suitable for use with flexible mechanical joints complying with the requirements specified in section four shall also be marked with the letter ‘J’.
13.5 Flexible mechanical joints supplied as separate components (e.g. ‘sleeves’ but not an integral spigot and socket system) shall be clearly and durably marked with the following:
(a) the trademark or name of the manufacturer; (b) the identification of the factory location If the manufacturer has more than one works;
(c) the number of this British Standard, i.e. ‘BS 65’; (d) the letter ‘J’ for use with normal pipes or the letters ‘J’ and ‘SW’ for use with surface water pipes; (e) if the joints are not supplied by the manufacturer of the pipes and fittings with which they are intended to be used, or if the manufacturer supplies incompatible systems (see the note to 9.1), the joints shall be clearly and durably marked to Identify the pipes or fittings with which they are compatible.